[docs] [issue23750] Clarify difference between os.system/subprocess.call in section "Replacing os.system()"

Martin Panter added the comment:

Here is a patch:

* Use different return value variable names and point out that they are encoded differently * Add another bullet point about signal handling * Fix os.system() documentation of the return value. My understanding is it is the C standard that does not define the return value, and Posix essentially means Unix.

---------- keywords: +patch stage: -> patch review versions: +Python 2.7, Python 3.4, Python 3.5, Python 3.6 Added file: http://bugs.python.org/file39767/system-subprocess.patch

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